Perpetual calendar.



P. P. McMlLLAN.

1 I PERPETUAL QAILENDAR.

I APPLICATION FILED MAR. 12, 1915.

Patented Feb. 15,1916.

,pMwzzzan PAUL P. McMILI AN, OF NEW YORK, N. Y.

PERPETUAL CALENDAR.

Specification of Letters Patent.

Patented Feb. 15, 1916.

Application filed March 12, 1915. Serial No. 13,913.

T 0. all whom it may concern Be it known that I, PAUL P. MCMILLAN,

a citizen of the United States, residing at New York. in the county of New York and State of New York, have invented certain new and useful Improvements in Perpetual Calendars; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to new and useful improvements in perpetual calendars. and has for its principal object to provide a calendar which is useful for an unlimited period and which will accurately give the desired information without in any way inconveniencing the user.

Another object of the invention is to provide a device which may be used as an advertising novelty and which is capable of being constructed from sheet material.

A further object of the invention is to provide a novel lock for holding the several members in proper position after they have been adjusted.

Still another object of the invention is to provide a lock as above mentioned which is capable of being used as a hanger by which the calendar may be hung or attached to any convenient support or place.

lVith these and other objects in view, the invention consists in the novel combination and arrangement of parts which will be fully set forth in the following specification and accompanying drawings, in which,

Figure 1 is a plan view of a calendar constructed in accordance with this invention. Fig. 2. is a transverse sectional view of Fig. 1, Fig. 3'is a plan view of the intermediate disk, and Fig. :1. is a detail perspective view of the locking member.

Referring now to the drawings by characters of reference, the numeral 1 designates as an entirety the base or bottom disk of the device which is formed with a central aperturc 2 and is provided around its periphery with a plurality of numerals 3 which are separated from each other by the division lines 4-.

In the preferred form of' the calendar,

there are thirty-one numerals to represent the usual thirtyoue days in a month. as clearly shown in Fig. 1\ The llltOlllltllllllC disk, designated generally by the numeral 5, comprises the body 6 having formed therein a central aperture 7, which aperture is provided with an offset portion the use of which will appear as the description proceeds.

A series of circles 7 are printed on the upper face of the disk 5 and inwardly from the periphery thereof, and these circles are preferably twelve in number and are lettered as at 8 to represent the difierent months in a year. Suitable figures 9 are printed in each of these circles, and these figures indicate the number of days in each month as will be clearly seen upon referring to the drawings, This intermediate disk is interposed between the top disk, designated generally by the numeral 10, and the bottom disk 1. and the top disk is provided with a suitable opening 11 which is of a diameter equal to the circles 7 and is so positioned that when the disk 10 or 5 is rotated around a comman axis, the letters 8 and figures 9 within the circles 7 may be visible through aperture 11.

A volute line 12 is printed on the upper face of the disk 10 which gradually winds inwardly as clearly shown, to a point designated by the numeral 13. This point 13 is in radial alinement with the line 14, which separates the designation Tuesday from \Vednesday in one of the weeks. This line 14 also serves as a center for the arcuate notch 15 formed in the periphery of the disk. There are seven of these notches 15 arranged as described and respectively ad'- jacentthe following designations on the periphery of the disk: Thursday, Friday, Saturday, Sunday, and Monday. These designations are separated by means of the lines 16, and form axes on which the arcuate notches are constructed. The balance of the designations 17 are arranged consecutively in names of the days of the week as clearly shown.

A suitable washer 18 overlies the upper face of the disk 10 and acts as a reinforcemcnt therefor. A suitable central pivot pin V gaged by the fingers of the user'to enable the intermediate disk to be turned.

In order to lock the disk against rotation, there is provided the latch member, best illustrated in Fig. 4, which is designated generally by the numeral 24, and this latch member comprises the loop 25 having formed thereon the angular extensions 26. These angular extensions are formed near the point where they join with a suitable aperture 27 through ;which the rivet 28 extends, and pivotally securesthe latch in place. One of the ends of the arms 26 is downturned as at 28, while the end of the opposite arm is upturned as at 29 and the upturned end is arranged'to engage in the notches 15, while the dawnturned end engages against the periphery of the disk 1. It will thus be seen that the latch member is locked against movement I in one direction, but is free to move in'the opposite direction, thus preventing' the upper disk from rotating when the intermediate disk is moved to the desired point.

It will be apparent from the foregoing that in use the disk 10 is set to the desired point with relation to the disk 5, where- 'upon the upper and intermediate disks are turned on the pivot until the first day of that month alines with the character 1 on the base disk .1. The numeral under or beneath the name of the month indicates the number of days in the month, and it will be apparent by referring to the numerals around the periphery of the disk 1, the user may ascertain the day on which the month ends.

After the device is set as hereinbefore described, the same may be hung by placing the loop 25 over a nail or attaching it to any suitable support and it will be evident that a perpetual calendar is provided which will accurately give the date and which will be easily and quickly set. I

While in the foregoing there has been shown and described the-preferred embodiment of this invention, it is to be understood thatsuch' changes may be made in the combination and arrangement of parts as will fall within the spirit and scope ofthe invention as defined in the claim.

What is claimed is: 4

In a calendar, a base disk, an intermediate disk, a notched top disk, a pivot holding the disks in operative relation, a latch member comprising a body having a pair of angularly extending arms pivoted to the base disk, one of the arms engaging in the notches in the top disk, and the other arm enga 'ng on the periphery of the base disk'to old the top disk against rotation "in"one direction, and a loop on the end of the latch to provide a hanger.

} In testimony whereof I aflix my signature in presence of two witnesses.

PAUL P. MOMILLAN. Witnesses:

ALLAN P. FRAZIER, J. B. SMITH. 

